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express

express - Fast, unopinionated, minimalist web framework for node. Express - Node.js web application framework


How to get the full url in Express?

Let's say my sample url is

http://example.com/one/two

and I say I have the following route

app.get('/one/two', function (req, res) {
    var url = req.url;
}

The value of url will be /one/two.

How do I get the full url in Express? For example, in the case above, I would like to receive http://example.com/one/two.


Source: (StackOverflow)

Express-js can't GET my static files, why?

I've reduced my code to the simplest express-js app I could make:

var express = require("express"),
    app = express.createServer();
app.use(express.static(__dirname + '/styles'));
app.listen(3001);

My directory look like this:

static_file.js
/styles
  default.css

Yet when I access http://localhost:3001/styles/default.css I get the following error:

Cannot GET / styles /
default.css

I'm using express 2.3.3 and node 0.4.7. What am I doing wrong?


Source: (StackOverflow)

How to get GET (query string) variables in Express.js on Node.js?

Can we get the variables in the query string in Node.js just like we get them in $_GET in PHP?

I know that in Node.js we can get the URL in the request. Is there a method to get the query string parameters?


Source: (StackOverflow)

How to access the GET parameters after "?" in Express?

I know how to get the params for queries like this:

app.get('/sample/:id', routes.sample);

In this case, I can use req.params.id to get the parameter (e.g. 2 in /sample/2).

However, for url like /sample/2?color=red, how can I access the variable color?

I tried req.params.color but it didn't work.


Source: (StackOverflow)

What is Express.js?

I am a learner in Node.js.

  1. What is Express.js?
  2. What is the purpose of it with Node.js?
  3. Why do we actually need Express.js? How it is useful for us to use with Node.js?
  4. What is Redis? Does it come with Express.js?

Source: (StackOverflow)

How can i set NODE_ENV=production in Windows?

In Ubuntu it's quite simple, I can run the application using:

$ NODE_ENV=production node myapp/app.js

However this doesn't work in Windows. Is there a configuration file where I can set the attribute?


Source: (StackOverflow)

Can't get rid of header X-Powered-By:Express

I am running a server on nodejs with express. I can't seem to get rid of the header:

X-Powered-By:Express

I was wondering if there is any way to get rid of this header or do I have to live with it?


Source: (StackOverflow)

npm WARN package.json: No repository field

I installed expressjs with the following command:

sudo npm install -g express

I have the following warning:

npm WARN package.json range-parser@0.0.4 No repository field.
npm WARN package.json fresh@0.1.0 No repository field.
npm WARN package.json methods@0.0.1 No repository field.
npm WARN package.json methods@0.0.1 No readme data.
npm WARN package.json cookie-signature@1.0.1 No repository field.
npm WARN package.json send@0.1.0 No repository field.
npm WARN package.json pause@0.0.1 No repository field.
npm WARN package.json bytes@0.2.0 No repository field.
npm WARN package.json github-url-from-git@1.1.1 No repository field.
npm WARN package.json assert-plus@0.1.2 No repository field.
npm WARN package.json ctype@0.5.2 No repository field.

Im new to nodejs and expressjs. Why I have the above warnings? Should I be worried?


Source: (StackOverflow)

How to retrieve POST query parameters?

Here is my simple form:

<form id="loginformA" action="userlogin" method="post">
    <div>
        <label for="email">Email: </label>
        <input type="text" id="email" name="email"></input>
    </div>
<input type="submit" value="Submit"></input>
</form>

Here is my Express.js/Node.js code:

app.post('/userlogin', function(sReq, sRes){    
    var email = sReq.query.email.;   
}

I tried sReq.query.email or sReq.query['email'] or sReq.params['email'], etc. None of them work. They all return undefined.

When I change to a Get call, it works, so .. any idea?


Source: (StackOverflow)

ExpressJS How to structure an application?

I'm using the ExpressJS web framework for NodeJS.

People using ExpressJS put their environments (development, production, test...), their routes etc on the app.js. I think that it's not a beautiful way because when you have a big application, app.js is too big!

I would like to have this directory structure:

| my-application
| -- app.js
| -- config/
     | -- environment.js
     | -- routes.js

Here's my code:

app.js

var express = require('express');
var app = module.exports = express.createServer();

require('./config/environment.js')(app, express);
require('./config/routes.js')(app);

app.listen(3000);

config/environment.js

module.exports = function(app, express){
    app.configure(function() {
    app.use(express.logger());
    });

    app.configure('development', function() {
    app.use(express.errorHandler({
        dumpExceptions: true,
        showStack: true
    }));
    });

    app.configure('production', function() {
    app.use(express.errorHandler());
    });
};

config/routes.js

module.exports = function(app) {
    app.get('/', function(req, res) {
    res.send('Hello world !');
    });
};

My code works well and I think that the structure of the directories is beautiful. However, the code had to be adapted and I'm not sure that it's good/beautiful.

Is it better to use my structure of directories and adapt the code or simply use one file (app.js)?

Thanks for your advices!


Source: (StackOverflow)

How to allow CORS?

I am trying to support CORS in my Node.js application that uses the Express.js web framework. I have read a Google group discussion about how to handle this, and read a few articles about how CORS works. First, I did this (code is written in CoffeeScript syntax):

app.options "*", (req, res) ->
  res.header 'Access-Control-Allow-Origin', '*'
  res.header 'Access-Control-Allow-Credentials', true
  # try: 'POST, GET, PUT, DELETE, OPTIONS'
  res.header 'Access-Control-Allow-Methods', 'GET, OPTIONS'
  # try: 'X-Requested-With, X-HTTP-Method-Override, Content-Type, Accept'
  res.header 'Access-Control-Allow-Headers', 'Content-Type'
  # ...

It doesn't seem to work. It seems like my browser (Chrome) is not sending the initial OPTIONS request. When I just updated the block for the resource I need to submit a cross-origin GET request to:

app.get "/somethingelse", (req, res) ->
  # ...
  res.header 'Access-Control-Allow-Origin', '*'
  res.header 'Access-Control-Allow-Credentials', true
  res.header 'Access-Control-Allow-Methods', 'POST, GET, PUT, DELETE, OPTIONS'
  res.header 'Access-Control-Allow-Headers', 'Content-Type'
  # ...

It works (in Chrome). This also works in Safari.

I have read that...

In a browser implementing CORS, each cross-origin GET or POST request is preceded by an OPTIONS request that checks whether the GET or POST is OK.

So my main question is, how come this doesn't seem to happen in my case? Why isn't my app.options block called? Why do I need to set the headers in my main app.get block?


Source: (StackOverflow)

Error: Can't set headers after they are sent to the client

I'm fairly new to Node.js and I am having some issues.

I am using Node.js 4.10 and Express 2.4.3.

When I try to access http://127.0.0.1:8888/auth/facebook, i'll be redirected to http://127.0.0.1:8888/auth/facebook_callback.

I than received the following error:

Error: Can't render headers after they are sent to the client.
    at ServerResponse.<anonymous> (http.js:573:11)
    at ServerResponse._renderHeaders (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/patch.js:64:25)
    at ServerResponse.writeHead (http.js:813:20)
    at /home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/auth.strategies/facebook.js:28:15
    at /home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/index.js:113:13
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/strategyExecutor.js:45:39)
    at [object Object].pass (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/authExecutionScope.js:32:3)
    at [object Object].halt (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/authExecutionScope.js:29:8)
    at [object Object].redirect (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/authExecutionScope.js:16:8)
    at [object Object].<anonymous> (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/auth.strategies/facebook.js:77:15)
Error: Can't set headers after they are sent.
    at ServerResponse.<anonymous> (http.js:527:11)
    at ServerResponse.setHeader (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/patch.js:50:20)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:162:13)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:195:11)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:150:23)
    at param (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/router.js:189:13)
    at pass (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/router.js:191:10)
    at Object.router [as handle] (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/router.js:197:6)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:198:15)
    at Object.auth [as handle] (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/index.js:153:7)
Error: Can't set headers after they are sent.
    at ServerResponse.<anonymous> (http.js:527:11)
    at ServerResponse.setHeader (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/patch.js:50:20)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:162:13)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:207:9)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:150:23)
    at param (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/router.js:189:13)
    at pass (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/router.js:191:10)
    at Object.router [as handle] (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/router.js:197:6)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:198:15)
    at Object.auth [as handle] (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/index.js:153:7)
Error: Can't set headers after they are sent.
    at ServerResponse.<anonymous> (http.js:527:11)
    at ServerResponse.setHeader (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/patch.js:50:20)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:162:13)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:150:23)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:207:9)
    at Object.auth [as handle] (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/index.js:153:7)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:198:15)
    at HTTPServer.handle (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:211:3)
    at Object.handle (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:105:14)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:198:15)
Error: Can't set headers after they are sent.
    at ServerResponse.<anonymous> (http.js:527:11)
    at ServerResponse.setHeader (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/patch.js:50:20)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:162:13)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:150:23)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:207:9)
    at HTTPServer.handle (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:211:3)
    at Object.handle (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:105:14)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:198:15)
    at /home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/session.js:323:9
    at /home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/session.js:338:9

node.js:134
        throw e; // process.nextTick error, or 'error' event on first tick
        ^
Error: Can't set headers after they are sent.
    at ServerResponse.<anonymous> (http.js:527:11)
    at ServerResponse.setHeader (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/patch.js:50:20)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:162:13)
    at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:207:9)
    at /home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/session.js:323:9
    at /home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/session.js:338:9
    at Array.<anonymous> (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/session/memory.js:57:7)
    at EventEmitter._tickCallback (node.js:126:26)

The following is my code:

var fbId= "XXX";
var fbSecret= "XXXXXX";
var fbCallbackAddress= "http://127.0.0.1:8888/auth/facebook_callback"

var cookieSecret = "node";     // enter a random hash for security

var express= require('express');
var auth = require('connect-auth')
var app = express.createServer();


app.configure(function(){
    app.use(express.bodyParser());
    app.use(express.methodOverride());
    app.use(express.cookieParser());
    app.use(express.session({secret: cookieSecret}));
    app.use(auth([
        auth.Facebook({
            appId : fbId,
            appSecret: fbSecret,
            callback: fbCallbackAddress,
            scope: 'offline_access,email,user_about_me,user_activities,manage_pages,publish_stream',
            failedUri: '/noauth'
        })
    ]));
    app.use(app.router);
});


app.get('/auth/facebook', function(req, res) {
  req.authenticate("facebook", function(error, authenticated) {
    if (authenticated) {
      res.redirect("/great");
      console.log("ok cool.");
      console.log(res['req']['session']);
    }
  });
});

app.get('/noauth', function(req, res) {
  console.log('Authentication Failed');
  res.send('Authentication Failed');
});

app.get('/great', function( req, res) {
  res.send('Supercoolstuff');
});

app.listen(8888);

May I know what is wrong with my code?

I'm really new to this, so sorry for just putting up the code here.

Thank you all in advance.


Source: (StackOverflow)

bodyParser is deprecated express 4

I am using express 4.0 and I'm aware that body parser has been taken out of the express core, I am using the recommended replacement, however I am getting

body-parser deprecated bodyParser: use individual json/urlencoded middlewares server.js:15:12 body-parser deprecated urlencoded: explicitly specify "extended: true" for extended parsing node_modules/body-parser/index.js:74:29

Where do I find this supposed middlewares? or should I not be getting this error?

var express     = require('express');
var server      = express();
var bodyParser  = require('body-parser');
var mongoose    = require('mongoose');
var passport    = require('./config/passport');
var routes      = require('./routes');

mongoose.connect('mongodb://localhost/myapp', function(err) {
    if(err) throw err;
});

server.set('view engine', 'jade');
server.set('views', __dirname + '/views');

server.use(bodyParser()); 
server.use(passport.initialize());

// Application Level Routes
routes(server, passport);

server.use(express.static(__dirname + '/public'));

server.listen(3000);

Source: (StackOverflow)

Node.js / Express.js - How does app.router work?

Before I ask about app.router I think I should explain at least what I think happens when working with middleware. To use middleware, the function to use is app.use(). When the middleware is being executed, it will either call the next middleware by using next() or make it so no more middleware get called. That means that the order in which I place my middleware calls is important, because some middleware depends on other middleware, and some middleware near the end might not even be called.

Today I was working on my application and had my server running in the background. I wanted to make some changes and refresh my page and see the changes immediately. Specifically, I was making changes to my layout. I couldn't get it to work so I searched Stack Overflow for the answer and found this question. It says to make sure that express.static() is beneath require('stylus'). But when I was looking at that OP's code, I saw that he had his app.router call at the very end of his middleware calls, and I tried to figure out why that was.

When I made my Express.js application (version 3.0.0rc4), I used the command express app --sessions --css stylus and in my app.js file the code came setup with my app.router above both the express.static() and require('stylus') calls. So it seems like, if it comes already setup that way, then it should stay that way.

After re-arranging my code so I could see my Stylus changes, it looks like this:

app.configure(function(){
  //app.set() calls
  //app.use() calls
  //...
  app.use(app.router);
  app.use(require('stylus').middleware(__dirname + '/public'));
  app.use(express.static(__dirname + '/public', {maxAge: 31557600000}));
});

app.get('/', routes.index);

app.get('/test', function(req, res){
  res.send('Test');
});

So I decided that the first step would be to find out why it is important to even have app.router in my code. So I commented it out, started my app and navigated to /. It displayed my index page just fine. Hmm, maybe it worked because I was exporting the routing from my routes file (routes.index). So next I navigated to /test and it displayed Test on the screen. Haha, OK, I have no idea what app.router does. Whether it is included in my code or not, my routing is fine. So I am definitely missing something.

So Here Is My Question:

Could somebody please explain what app.router does, the importance of it, and where I should place it in my middleware calls? It would also be nice if I got a brief explanation about express.static(). As far as I can tell, express.static() is a cache of my information, and if the application can't find the requested page, it will check the cache to see if it exists.


Source: (StackOverflow)

Failed to load c++ bson extension

A total node noob here. I've been trying to set up a sample node app but the following error keeps popping up every time I try to run:

node app

Failed to load c++ bson extension, using pure JS version

events.js:72
        throw er; // Unhandled 'error' event
              ^
Error: failed to connect to [#$%67890 :27017]
    at null.<anonymous> (/home/thejazeto/code/nodejs/authen/node_modules/mongoose/node_modules/mongodb/lib/mongodb/connection/server.js:553:74)
    at EventEmitter.emit (events.js:106:17)
    at null.<anonymous> (/home/thejazeto/code/nodejs/authen/node_modules/mongoose/node_modules/mongodb/lib/mongodb/connection/connection_pool.js:140:15)
    at EventEmitter.emit (events.js:98:17)
    at Socket.<anonymous> (/home/thejazeto/code/nodejs/authen/node_modules/mongoose/node_modules/mongodb/lib/mongodb/connection/connection.js:512:10)
    at Socket.EventEmitter.emit (events.js:95:17)
    at net.js:830:16
    at process._tickCallback (node.js:415:13)

Source: (StackOverflow)